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Is SQL unknown identical to NULL?

score 8800 · Answer 1 · 2016-12-16T08:58:05.993000

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TechQA.

List Question

Is SQL unknown identical to NULL?

OData request that returns items not matching the filter

SQLthree valued logic - do de Morgan's laws apply?

Numeric comparisons with NA values causing bad subsets in R

Example of three valued logic in SQL Server

Logical operations in modal three-valued logic (XOR, IMP EQV)

SQL that check for Duplicates with NULL doesn't not return

How to apply 3-valued-logic to SQL queries?

Options for eliminating NULLable columns from a DB model (in order to avoid SQL's three-valued logic)?

Implementation of SQL's three-valued logic

NOT IN does not produce same results as NOT EXISTS

compare three variables and get the variable with min/max value back (not value)

Can anyone tell me why my case statement return null(good)

Spark Scala : Check if string isn't null or empty

A three-valued boolean logic with Z3 solver

All possible combinations of Three-valued logic values

SQL how to store meaningful null values?

How should I test a field against an SQL variable which can be null?

Why is `NOT(NULL=NULL)` false?

SQL 'Or' operator. How does it work in the following scenario?

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